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Synchronous Pumice Mantle Found on Santorini Volcano

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Synchronous Pumice Mantle Found on Santorini Volcano International Journal of Geosciences, 2021, 12, 329-346 https://www.scirp.org/journal/ijg ISSN Online: 2156-8367 ISSN Print: 2156-8359 Synchronous Pumice Mantle Found on Santorini Volcano Walter L. Friedrich1*, J. Richard Wilson1, Annette Højen Sørensen1, Samson Katsipis2 1Department of Geoscience, Aarhus University, Aarhus, Denmark 2Museum of Minerals and Fossils, Perissa, Greece How to cite this paper: Friedrich, W.L., Abstract Wilson, J.R., Sørensen, A.H. and Katsipis, S. (2021) Synchronous Pumice Mantle Found It is generally accepted that the vent of the 3.6 ka Minoan eruption was si- on Santorini Volcano. International Journal tuated in the water-filled Santorini caldera prior to the Minoan eruption. One of Geosciences, 12, 329-346. should therefore expect to find huge quantities of pumice and ash on the in- https://doi.org/10.4236/ijg.2021.124018 ner side of the caldera walls, but there is only a relatively small amount pre- Received: February 26, 2021 served. An unexpected discovery of remnants of a synchronous pumice man- Accepted: April 12, 2021 tle of the Minoan eruption appears to solve this enigma. A lengthy period of Published: April 15, 2021 erosion and the intensive quarrying of pumice for the construction of the Copyright © 2021 by author(s) and Suez Canal (1859 to 1869) led to the removal of an enormous amount of ma- Scientific Research Publishing Inc. terial and information for generations of geologists. The synchronous pumice This work is licensed under the Creative mantle covered the whole caldera wall from rim to sea level. Archaeological Commons Attribution International finds under the pumice mantle show that the caldera wall was accessible and License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ inhabited in the Bronze Age. Furthermore, this discovery documents that Open Access only one Minoan eruption took place and that the so-called “Lower pumice” does not exist on Santorini. Keywords Minoan Eruption, Tephrochronology, Visual Geology, Geoarchaeology 1. Introduction The 3.6 ka Minoan eruption was one of the strongest experienced by human- kind. On Santorini it buried a flourishing culture under a thick mantle of pumice and ash, thus creating a “prehistoric Pompeii” as it was called by Fouqué [1]. Three main phases of the eruption can be recognised in the deposits as described by Friedrich [2] (Figure 1). Prehistoric ruins on the island of Therasia and a prehistoric house on Thera were excavated by French scholars. After a period of about 120 years with no activity, excavations were started at Akrotiri in 1967 by DOI: 10.4236/ijg.2021.124018 Apr. 15, 2021 329 International Journal of Geosciences W. L. Friedrich et al. Figure 1. The photo shows the three main phases of the Minoan eruption in Fira quarry (ca. 200 m asl). The eruption column of the first phase (yellow arrow) reached a height of several kilometres and gave rise to air fall deposits of pumice. The entry of sea water into the magma chamber triggered ring-shaped explosions that produced base surge deposits during the second phase (green arrow). The crater widened in the third eruption phase and created pyroclastic flow (red arrow). Material on the walls of the chamber was also ejected and created bomb sacs (above the persons) in the unconsolidated deposits (Photo Friedrich). Marinatos [3]. Here a Bronze Age town with houses with up to three stories has been excavated [4]. The houses were decorated with colourful wall paintings [5] and contained decorated pottery and other artwork. A detailed description of the Minoan eruption and its consequences for Santorini and the surrounding area is given elsewhere [6]. Here we focus on the first eruption phase, the Plinian air fall pumice that produced a huge fan that covered the Eastern Mediterranean area, creating a valuable marker horizon for both geological and archaeological correlations. The synchronous ash and pumice mantle provides a valuable tool for the chronology since all objects that are in direct and undisturbed contact with this volcanic tephra fan have the same maximum age. This pumice mantle covered the entire volcanic edifice on Santorini. One should therefore expect to find a huge amount of pumice and ash on the inner side of the Santorini caldera wall. The absence of this material remained an enigma until recent discoveries. A new series of eruptions on Nea Kameni (1866-1870) attracted numerous scientists to Santorini to study the spectacular events in the caldera and the DOI: 10.4236/ijg.2021.124018 330 International Journal of Geosciences W. L. Friedrich et al. newly found prehistoric ruins that had been discovered under the pumice on Therasia. At that time Minoan pumice was being quarried on Thera and Thera- sia and shipped to Egypt for construction of the Suez Canal (1859 to 1869). When the French geologist Fouqué visited Santorini for the first time in 1866, he met a volcanic island that had experienced recent major changes. Pumice that had been deposited by the Minoan eruption on the inner side of the Santorini caldera was the first to be removed by this quarrying. This pumice removal led to the loss of an enormous amount of geological and archaeological informa- tion—a loss that led to wrong conclusions being made. In the 1870s Fouqué [7] considered that the volcano had produced two distinct pumice units; the Upper Pumice Series (ponce superieur) representing Minoan products) on the top of the island and the Lower Pumice Series (ponce inferieur) that represented older erup- tion products that were sandwiched between older and younger volcanic layers (Figure 2). Fouqué [7] [8] considered that a volcano with a height of about 450 m had existed in the central part of Santorini prior to the Minoan eruption. 2. Abandoning the Two Eruptions Concept Fouqué’s two eruptions concept was supported by a detailed illustration of the caldera walls by Neumann van Padang [9]. Since that time, the two eruptions concept was implemented in geological maps by Pichler and Kussmaul [10] and Druitt et al. [11]. Generations of geologists [12]-[18], including the senior author Figure 2. Santorini caldera with Cape Alonaki in the left centre photographed in 1980. The still active Karageorghis quarry is visible in the right centre. Pumice is clearly present at two levels. Here Ferdinand Fouqué showed in 1879 the two pumice units (inserted drawing with arrows pointing to the lower and upper pumice series) thus giving the im- pression of two different eruptions. We now claim that both represent Minoan eruption products that were deposited on two terraces on the caldera wall (Photo Friedrich). DOI: 10.4236/ijg.2021.124018 331 International Journal of Geosciences W. L. Friedrich et al. (WLF), considered that the two apparent layers represented two different vol- canic eruptions. This two eruptions concept spread to other areas in the Medi- terranean where it was used in the interpretation of volcanic deposits found in several deep-sea drillings. However, this concept was abandoned when chemical analyses showed that the Lower Pumice Series encountered in the deep wells of the Mediterranean was not from Santorini [19] but had an Italian source. This was the beginning of a major change in the interpretation of the stratigraphy of the Aegean area and Santorini [20]. Today we claim that the so-called Lower Pumice Series does not exist (Figure 3). It is in fact part of a synchronous pumice Figure 3. Schematic profiles through the caldera wall of Santorini. (a) Old concept with two pumice series with different ages. (b) The synchronous Minoan pumice mantled the entire caldera. (c) After erosion and extensive quarrying pumice only remains on terraces on the caldera wall (Wilson/Friedrich). (d) Locations of places named in the text: (1) Akrotiri excavation; (2) Balos excavation; (3) Raos excavation; (4) Kokkinopetra volcano; (5) Mavro volcano/Mesa Pigadia; (6) Alafousos quarry; (7) Kimisi; (8) Skaros castle; (9) Plaka. (e) Sites where pumice was loaded on to ships: (1) Alafousos; (2) Kimisi; (3) Balos; (4) Mavromatis; (5) Plaka; (6) Karageorghis; (7) Fira; (8) Katofira; (9) Amudhi; (10) The- rasia; (11) Manolas. DOI: 10.4236/ijg.2021.124018 332 International Journal of Geosciences W. L. Friedrich et al. mantle of the Minoan eruption remaining on terraces on the inner side of the caldera wall, as will be shown below. Geologists, metaphorically speaking, grad- ually “opened” the caldera more and more. The investigations of the above- mentioned groups led to general acceptance that there existed a flooded caldera prior to the Minoan eruption. This new development had some influence on in- terpretations by archaeologists and of the landscapes depicted on the wall paint- ings found in the Akrotiri excavation [21] [22] [23]. This development made it possible to imagine that the naval procession depicted in the Ship Fresco could have taken place in the flooded Santorini caldera [23]. Furthermore, lithic material in the eruption products of the Minoan eruption indicates that a so-called pre-Kameni island had existed in the water-filled Bronze Age caldera roughly where the present-day Kameni islands are situated. A break- through came in 1990 when the investigation of 1450 stromatolites (algae-bacterial build-ups), some of them radiocarbon dated, revealed that a flooded caldera had existed prior to the Minoan eruption [24]. This study of stromatolites that had been ejected during the Minoan eruption led to general acceptance of the idea that the caldera already existed prior to the eruption. Furthermore, numerous marine fossils found embedded in the stromatolites compellingly prove that the caldera was open and connected to the open sea, since the marine fossils needed normal temperatures and salinity to propagate [25]. Abandoning the idea of the existence of a high central volcano before the Mi- noan eruption and acceptance of the presence of an open, water-filled caldera, means that it should be possible to find large amounts of volcanic ash and pu- mice from the Minoan eruption on the inner sides of the Santorini caldera walls.
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